package soket;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/**
 * 聊天室服务端    上传到gite
 */

public class Server {
    private ServerSocket serverSocket;

    private List<PrintWriter>allOut=new ArrayList<>();//该集合存放所有客户端的输出流用广播消息
    public Server(){
        try {

                System.out.println("正在连接服务端...");
                serverSocket=new ServerSocket(8088);
                System.out.println("服务端连接成功！");


        } catch (IOException e) {
            e.printStackTrace();
        }
    };
    public void start(){
        try {
            while (true) {
                System.out.println("等待客户端连接。。。");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端连接了！");
                ClientHandler handler=new ClientHandler(socket);
                Thread t=new Thread(handler);
                t.start();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server server=new Server();
        server.start();
    }
    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;//记录该客户端的IP地址信息
        public ClientHandler(Socket socket){
            this.socket=socket;
            host=socket.getInetAddress().getHostAddress();
        }

        @Override
        public void run() {
            PrintWriter pw=null;
            try {
                InputStream in=socket.getInputStream();
                InputStreamReader isr=new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br=new BufferedReader(isr);
                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw=new OutputStreamWriter(out,StandardCharsets.UTF_8);
                BufferedWriter bw=new BufferedWriter(osw);
                pw=new PrintWriter(bw,true);
                //将该输出流存入共享集合allout
                synchronized (allOut){
                    allOut.add(pw);
                }

                System.out.println(host+"上线了，当前在线人数："+allOut.size());
                String message;
                while ((message=br.readLine())!=null){
                    System.out.println(host+"说："+message);
                    //将所有消息回复给所有客户端
                    synchronized (allOut){
                        for (PrintWriter o:allOut){
                            o.println(host+"说："+message);
                        }
                    }

                }
            } catch (IOException e) {
                e.printStackTrace();
            }finally {

                allOut.remove(pw);//将当前客户端从集合中删除
                System.out.println(host+"下线了，当前在线人数"+allOut.size());
                try {
                    socket.close();

                } catch (IOException e) {

                }
            }


        }
    }
}
